Hello Gents,

My 2012 XFR just hit 100k on Monday and this morning.....Bam! ... Cel with POO16 & POO17 and PO52A... Basically the timing is off due to a broken timing chain guide. I started to notice a strange noise, like an exhaust leak, about a month ago and noticed that my gas mileage dropped dramatically to around 14 mpg. I wasn't able to achieve full boost. Has anyone had this experience and what parts did they order and how much was the approximate cost? I called the dealership and they wanted around $7k. An Indy shop wanted $5k.... Should I buy the parts independently and shop around for a Indy?

Any help would be appreciated!

Thank you!

 

How do you know it's a broken chain guide?

Have the cam covers been removed to inspect the extent of the damage?

 

+1

Firstly, I feel for you. It's a horrible situation to be in. However, I'm not a great believer in telephone dignostics. If you are happy to throw several thousand dollars at a theory then go ahead. I would want to know exactly what's wrong before writing a blank cheque.

I agree with NBCat'srecommendation and would be doing some preliminary investigation myself. Once it goes into a shop and they do any stripping, you are then almost locked in to letting them finish the work.

Graham

 

I may be wrong however I believe your engine is an interference engine.

That means if the timing chain missed a couple of sprockets when and if the tensioner broke you could have suffered piston and valve damage.

Which would cost way more than simply chain and guide replacement.

Would not be difficult or that costly to have a mechanic check for that first.

 

I am going off the codes (timing related), the slapping chain noise near the timing chains, car now sounds like a Chevy small block, and audible inspection at the local Jaguar dealership. What else could it be?

 

The Jaguar dealership that they could inspect/diagnosis but that could cost $1000 - $1500. Of course, that could be applied to their overall cost. Not ready to throw down $7000 at the dealership.

 

The challenging aspect is to find the right mechanic to look at it. I will be calling British/ Range Rover repair shops since there are more of those vehicles on the road with this engine.

 

OP sorry for your potential loss.



I've been told the opposite, non-interference. Anyone have definitive info on here?

I thought the VVT engines could not be interference (and talked to Stuart at Velocity and he mentioned it was not interference)

 

It would be better news if it is not for sure.

 

So an update - I spoke with Customer Care at Jaguar of JLR of North America and they said that they never heard of this problem. Right! .. However, they are wiling to contact the local dealership to discuss the problem and see if JLR might be able to provide some assistance - fingers crossed! I called eight of the top Jag/LandRover shops and six of them wouldn't touch the job because of the complexity. One shop reluctantly quoted me around $3500 with parts, but there was some hesitation on the phone about what was required in terms of parts. The second shop is still getting back to me.... Fingers crossed that JLR might help the situation.

 

I hope you get a decent firm quote.

 

I'm unclear exactly which engine the OP has but a VVT engine can be interference - as e.g. the STR 4.2 engine is (in both its VVT and non-VVT forms).

I think the OP's is the 4.2 AJV8 or is derived from it, so will be interference I expect.

 

The OP's first post says he has a 2012 XFR, so the 5.0 AJ133 SC.
Which I am sure I have read somewhere is an interference engine.

 

JLR have a TSB out on the Range Rover 5.0 engine referring to the chain guides and they I think refer to "possible serious" engine damage if the problem arises and is not rectified. They have a VIN range for affected vehicles.

https://static.nhtsa.gov/odi/tsbs/20...04461-9340.pdf

There is a class action lawsuit filed against JLR siting the TSB as evidence that they know about the problem. It is not going anywhere.

 

This may sound dumb but could it possibly just be a problem with the camshaft position sensors?

 

This whole discussion is pointless until someone removes the cam covers to inspect the position of the camshafts and timing chain guides. If the exhaust cams have 'jumped' more than one tooth, there is the likelihood of bent valves being the result.

The AJ-V8 in all iterations is an interference engine should the secondary timing chain fail.

 

I'm also interested to know what
means.

Tapping up the top end? Knocking at the bottom?

How's your oil level, OP?

 

This is a big problem across the platforms. The fact is that the service of timing chain, timing chain tensioners or guides is not in the "Passport to Service" guide provided with our vehicles.

 

It might be if I wasn't hearing chain slap.. I was hoping it was a Cam Position Sensor but the codes show otherwise (POO16 & P0017) - Crankshaft Position Correlation and P052A (Camshaft positioning timing over-advance).

 

I am having this discussion because:

1.) The timing tensioners and guides are a know issue across the platform
2.) Trying to diagnosis the issue of the codes (P0016, P0017 & P052A)
3.) Indy mechanic and dealer both hear chain slap.
4.) Codes are indicative of a timing issue
5.) It requires a thousand dollars to diagnosis (access and remove valve covers)
6.) It could effect everyone on this forum, since I keep my Jag up to service standards, and the Indys tell me that this is a big problem with this engine.
7.) Last but not least....I'm paying